>> reporter: there are wind chill advisories tonight through early tomorrow from montana to ohio, so, let's bring back that polar map and show you the wind chill in chicago, just one of the many cities that are concerned about the dangerous wind chill. by tomorrow morning, it will feel like 20 below in chicago. other cities like milwaukee, des moines, detroit, anyone surrounding the great lakes there, going to be very uncomfortable and close to dangerous. diane? >> all right, thank you so much, ginger zee, reporting in. and next tonight, we turn to the big surprises today in that culture war under way in arizona. the one that pits religious liberty against equal rights for gay americans. well, today, some big american companies warned the governor of the state, jan brewer, against signing that bill. in fact, even mitt romney weighed in, and not the way you might think. abc's cecilia vega tells us. reason. >> reporter: outrage at the state capital.